whatportis.com

Port 4652 services

2 entries are registered on port 465. It is a well-known port (0–1023) — assignments here are IANA's, and a service found on one is usually the service that was assigned it.

entries
2

services registered on this number

transport
tcp

1 transport in use

in transit
1/2

entries encrypted on the wire

worst risk
4/10

0 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:465SMTP over SSLcaution
:465SMTPScaution

01SMTP over SSLtcp · unofficial · risk 4/10

Port 465 is commonly used for secure SMTP communication, encapsulating email transmission within SSL encryption. This port facilitates encrypted email delivery between clients and mail servers, enhancing privacy compared to traditional plain-text SMTP connections. Although it was initially designated as a secure SMTP port, its status has shifted over time, but it remains widely supported for legacy encrypted email connections.

port 465 as SMTP over SSL →

02SMTPStcp · unofficial · risk 4/10

Port 465 was initially used for the Secure SMTP (SMTPS) protocol, providing encrypted email transmission via SSL. Despite its early deprecation in favor of STARTTLS on port 587, it has seen a resurgence in use for secured email submissions. This port helps facilitate confidential communication between email clients and servers, ensuring message privacy over potentially insecure networks.

port 465 as SMTPS →
filed underEmailSecurityNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 465 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.

linux
ss -ltnp | grep ':465\b'
macos
lsof -nP -iTCP:465 -sTCP:LISTEN
windows
netstat -ano | findstr :465

On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.

A port number is not a service. Anything may listen on 465 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.

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